<template>
  <div class="header">
    <div class="collapse-btn" @click="collapseChange">
      <i class="el-icon-menu"></i>
    </div>
    <div class="logo">musci 后台管理系统</div>
    <div class="header-right">
      <div class="btn-fullscrean" @click="HandleFullScreen">
        <el-tooltip :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
          <i class="el-icon-rank"></i>
        </el-tooltip>
      </div>
      <div class="user-avator">
        <img src="@/assets/img/user.png"/>
      </div>
      <el-dropdown class="user-name" trigger="click" @click="handleCommand">
        <span class="el-dropdown-link">
          {{userName}}
        </span>
        <i class="el-icon-caret-bottom"></i>
        <el-dropdown-menu slot="dropdown">
          <el-dropdown-item command="logout">退出登录</el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
import bus from '@/assets/js/bus'
export default {
    name: 'HeaderIndex',
    components: {},
    props: {},
    data () {
      return {
        collapse: true,
        fullscreen: false,
      }
    },
    computed: {
      userName() {
        return localStorage.getItem('userName');
      }
    },
    watch: {},
    created () {},
    methods: {
      // 侧边栏折叠
      collapseChange() {
        this.collapse = !this.collapse,
        bus.$emit('collapse',this.collapse)
      },
      // 全屏事件
      HandleFullScreen() {
        if(this.fullscreen){
          if(document.exitFullscreen){
            document.exitFullscreen();
          }else if(document.webkitCancelFullScreen){      //safari 、Chrome
            document.webkitCancelFullScreen();
          }else if (document.mozCancelFullScreen){        //firefox
            document.mozCancelFullScreen();
          }else if(document.msExitFullScreen){            //ie
            document.msExitFullScreen();
          }               
        }else{
          let element = document.documentElement;
          if(element.requestFullscreen){
            element.requestFullscreen();
          }else if(element.webkitRequestFullScreen){      //safari 、Chrome
            element.webkitRequestFullScreen();
          }else if(element.mozRequestFullScreen){         //firefox
            element.mozRequestFullScreen();
          }else if (element.msRequestFullScreen){         //ie
            element.msRequestFullScreen();
          }
        }
        this.fullscreen = !this.fullscree
      },
      handleCommand(command) {
        if(command == "logout"){
          localStorage.removeItem('userName'),
          this.$router.push('/')
        }
      }
    }
}
</script>
<style scoped>
.header {
  position: relative;
  background-color: #000;
  box-sizing: border-box;
  width: 100%;
  height: 70px;
  color: #fff;
}
.collapse-btn {
  float: left;
  padding: 0 21px;
  cursor: pointer;
  line-height: 70px;
}
.header .logo {
  float: left;
  line-height: 70px ;
}
.header-right {
  float: right;
  padding-right: 50px;
  line-height: 70px;
  display: flex;
  align-items: center;
}
.btn-fullscrean {
  transform: rotate(45deg);
  margin-right: 5px;
  font-size: 24px;
}
.user-avator {
  margin-left: 20px;
}
.user-avator img {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
}
.user-name {
  margin-left: 10px;
}
.el-dropdown-link {
  color: #fff;
  cursor: pointer; /* 光标呈现为指示链接的指针（一只手）*/
}
</style>